Geographical timepiece.



No. 7o|.853. Pai-enten lune so, um.

c. E. mm.

Gf-:QGHAPMGAL 'wwwa (Application filed Feb. 1B, 1901.)

QNO Model.)

HIS ATTORNEY UNrrnn CHARLES n.

Devis, or new Yoan, nanna n. irrinaowna, or New Yoan,

Assrenon or ons-THIRD To n. Y'l,

GGRAMniiSAl. TliViEPlECE.

` SPECFECTN forming part of :Lettersatent No. 701.5853, dated June 10, 1902.

y Application filed February `l8 y 1901. Serial No. 47,889. (No model.)

ToA all whom it may concern:

Be it'known that I, CHARLES Davis, a citizenV of the United States of America, and a resident of N ew York city, county and State of New York., have invented certain new and useful Improvements in Geographical rlimepieces, of which the following is a specification; reference being had Ato the accompanying drawings. forming a part thereof. l

My invention relates to improvements in geographical timepieces, and particularly to Watches having dials upon their opposite faces. I

My invention consists in providing a timepiece with dials upon. opposite faces thereof,l one of the dials heing divided off into the twelve hours of the day or night and having the ordinary minute and hour hands 'for use' in connection therewith and theother of said dials divided off into thetwenty-four hours of the day and night and having a geographical dish onwhioh is denoted various localities throughoutthe world, said"disk adapted to maire one revolution every twenty-four hours and to rotate in proximity to the said twenty-four-hour dial and preferably havbe told, asin watches of ing a minute-hand to rotate in connection therewith.

The main object or" myinvention is to provide a simple and convenient form of timepiece hyvwhich the time at one locality may ordinary construetion, and also in which 'the relative time may loe told for other localities thronghout'the world. A

A further object of my invention and one which is attained by the particular construetionand arrangement of parts employed is to be able to connect my gedgraphicalv time mechanism with timepieces of ordinary construction, such as are commonly .in use.

. To this end my invention comprises certain novel fea-tures of construction and combination of parte, will hereinafter be more .-nlly set forth. 1

I will now proceed to describe my invention with reference to the accompanying drawings and will than point out the novel features in claims.

1n the drawings, Figure 1 is a face View of the obverse side of a timepiece embodying my 6, loosely mounted upon 3 and geared to rotate therewith by the ordiinvention. Fig. 2 is a face view of the reverse side thereof. Fig. 3 is a side elevation,` partially'in central transverse section, of the same. Fig. e is a detail View of certain gearingl employed.

The timepiece comprises the ordinary case 1 of awatch, having a stationary dial 2Iupon one side thereof'of ordinary form and which is divided o into the twelve hours of the day or night. A minute-spindle 3, deriving motion from the usual watch-spring and through the ordinary train of gears, (not shown, makes one revolution for every hour, the direction of rotation being, as is usual, from left toright with respect to the stationary dial 2, or in lthe direction of the arrow in Fig. 2. A minute-hand 4C is secured to rotate with the minute-spindle 3 and indicates minutes upon the stationary da'al 2 in the usual manner. An hour-hand 5 is secured to an hour-sleeve the minute-spindle nary train of reducing-gears 7, 8, 9, and 10, so that the said hour-hand 5 will rotate in the same direction as the minute-hand 4, but at one-twelfth the speed. The gear-wheel 7 is fastened upon the minute-spindle 3 and has a ratio of one to four with the intermediate gear-wheel 10. The intermediate'gear-wheel 9 is secured to rotate with the intermediate gear-wheel 10 and has a ratio of one to three with the gear-wheel 8, which is mounted -fast upon the hour-sleeve 6, and a ratio of one to twelve between the minute-spindle 3 andthe hour-sleeve is thereby attained.

As so far described the mechanism is that of an ordinary timepiece, and the parts shown and described are merely intended to represent the parts of a timepiece of any ordinary or well-known construction. Upon the opposite face of the said timepiece I have secured 'a stationary dial 11, said dial being divided oif into the twenty-four hours of the day and night. l have secured the said dial to the case of the watch by bolting-screws 12. have extended the minute-spindle-S through the rear face of the timepiece and have secured to rotate therewith a pinion 13, and I have loosely mounted upon the said minutespindle another pinion 14, said pinion having an uprising sleeve connected therewith. The4 IOO said pinion 14 engages with an intermediate gear-wheel 15, mounted upon an independent stud 16, and secured to rotate with the said intermediate gear-wheel 15 is anotherintermediate gear-wheel 17. An idler gearwheel 18 is independently mounted and meshes with the said intermediate'gear-wheel 17 and the pinion 13, which is secured to the minute-spindle 3. and intermediate gear-wheel 17 are all of the same size as each other,-as are also the pinion 14 and intermediate gear-wheel 15. The effect of this will be that the pinions 13 and 14 will rotate at the same rate of speed with respect to a 'fixed point, but in opposite directions.

A minute-hand 19 is mounted upon the sleeve of the pinion 14 and rotates therewith, and the said hand and sleeve will, by reason ef the gearing just described, make one revolution per hour. The direction of rotation will be from right to left with respect to the twenty-four-hour dial 11, or-in the direction of the arrow shown in Fig. 1. The pinion 14 meshes also with a gear-Wheel 20, said pinion and gear-wheel having a ratio of one to three. The gear-wheel 20 carries with it a small pinion 22, which meshes with a gear-wheel 23, loosely mounted u pon the sleeve ofthe pinion 14. The' ratio of the pinion 22 and the gear-wheel 23 is asoneis to eight. The gear-Wheel 23willhenee rotate in the same direction asthe pinion 14, but will make but one revolution for every twenty-four revolutions made `by the said pinion 1li. The pinion 22 carries a geographical disk 24, which is secured to rotate therewith, and the said geographical disk has denoted thereon various localities throughout the world. The gear-wheel 23 also preferably carries an hour-hand 25, which is secured to rotate therewith and which will be initially set with respect to the geographical disk opposite the point at which is denoted the locality at which the timepiece is to be used. Fig. 1 shows the said hand registering with the words New York upon the disk 24, the watch illustratedbeing intended for use in New York.

The geographical side of the timepiecenamely, that side which is illustrated in Fig. 1 of the drawings-Will indicate the time for various localities throughout the'world, such time being read by noting the hour and fractions of the hour opposite that point upon the disk 2i at which is denoted the locality at which it is desired to read the time. The hour and fractions of the hour at such point will denote the time at that locality with rcspeet tothe time indicated by the hour-hand 25. Upon turning the watch around the time may be read upon the dial 2 in the ordinary manner.

lt desired, the time indicated upon the dial 2 may represent the time in one locality, while the time indicated hy the hand. 2:3' with .respect to the dial ll may represent thiA lime in some other locality, and the relative times in the various other localities will be repre The pinion 13, idler 1S,

sented with relation to the time at the locality designated by the hand 25.

By my construction and arrangement of parts it will be seen that l am enabled to convert an ordinary timepiece of the watch type to a geographical timepiece by merely removing the back cover, lengthening the minutespindle, and adding the gearing, dial, disk, and hands, as shown and described. All the added parts by reason of their construction and arrangement are placed outside the ordinary back of the watch, and the interior works of the timepiece are not deranged, ner do they require to be specially constructed. I am thus enabled to convert a timepiece of ordinary construction into a geographical timepiece with a small amount ot trouble and expense.

It is obvious that various modifications and changes may be made in the construction shown and above particularly described within the spirit and scope' ot' my invention.

1. In a geographical timepiece, the combination with two fixed dials upon opposite faces thereof, one of said dials divided oit into the twelve hours of the day or night, and the other of said dials divided off into the twenty-four hours of the day and night, of hour and minute hands for the twelve-hour dial, driving mechanism for driving the same, a geographical disk arranged to rotate in proximity to said twenty-four-hour dial, and a reversing gear-chain driven from the driving mechanism of the hands of the twelvehour dial and drivn'g said geographical disk adapted to dri-ve the same at half the speed of the hourhand ofthe twelve-hour dial, and composed entirely of continuous spur-gears whereby it is adapted to transmit motion continuously from said driving mechanism to the geographical disk, and to rotate the same in the opposite direction to the hands ofthe twelve-hour dial.

2. 1n a geographical timepiece, the combination with two iixed dials upon opposite faces thereof, of a minute-spindle, a pinion secured to rotate therewith, a pinion loosely mounted upon said minute-spindle, two intermediate gear-wheels secured to rotate together, one of said intermediate gear-wheels meshing with one of said pinions, an idler gear Wheel, independently mounted, and meshing with the other said pinion. and with the other intermediate gear-wl1eel, the ratio of said gearing'being such that the two said. pinions rotate at the same rate of speed with respect to a fixed point, but in opposite directions to each other, and a hand secured to rotate with each said pinion, one in proximity with the said dial on one face of the timepiece and the other in proximity to the said dial on the opposite face thereof.

25. 1n a geographical timepiece, the combination with two fixed dials upon opposite faces thereof, one of the said dials divided oil' into the twelve hours el' the day or night., and thc other ot' the said dials divided oit into the t., of a to make one revolu- "tion per hour9 in direction from left to right with respeet 'to tire twelve-Joni' dial,a minutehand secured thereon proximity' to the said twelve-hour dial, an hour-sleeve mounted en said minute-sleeve and geared to rotate 'thereon at a ratio of one to twelve therewith, an hour-hand mounted on said honi-sleeve, a pinion secured to said minute-spindle,apinion loosely mounted upon said minute-spindle, two intermediate igear-Wheelsl secured to rotate together, one of said intermediate gear- Wheels meshing with one of said pinions, an idler gear-WheeLindepende-ritly mounted,and meshing with the other said pinion and with the other said intermediate gear-Wheel, the ratio of said gearing being such that the two vdirections to each other,

saidA pinions rotate at the same rate of speed with respect .to a xed point, but in opposite a minute-hand secured to rotate with the pinion which is loosely mounted upon the said minute-spindle, and in proximity to the said twenty-four-hour dial, another hour-sleeve loosely mounted upon vthe axis of the minute spindle, and geared to rotate with respect to the last-mentioned pinion at the ratio of one to twentyfour, and a geographical disk, having various localities denoted thereonysecured to rotate With said last-named hour-sleeve, and in proximity to the said tWenty-four-hour dial.

CHARLES E. DAVIS. Witnesses:

D. HOWARD HAYWooD, HARRY T. Goss. 

